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参数资料
| 型号： | LTC3421EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.5A 24QFN |
| 标准包装： | 91 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 4.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 3MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3421
3A, 3MHz Micropower
Synchronous Boost Converter
with Output Disconnect
FEATURES
DESCRIPTIO
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Synchronous Rectification: Up to 96% Efficiency
True Output Disconnect
Inrush Current Limiting
Very Low Quiescent Current: 12 μ A
Up to 1.5A Continuous Output Current
Fixed Frequency Operation Up to 3MHz
0.5V to 4.5V Input Range
2.4V to 5.25V Adjustable Output Voltage
Guaranteed 1V Start-Up
Programmable Current Limit
Programmable Soft-Start
Synchronizable Oscillator
Manual or Automatic Burst Mode ? Operation
Low-Battery Comparator
< 1 μ A Shutdown Current
1.22V Reference Output Voltage
Small (4mm × 4mm) Thermally Enhanced QFN
Package
The LTC ? 3421 is a high efficiency, current mode, fixed
frequency, step-up DC/DC converter with true output dis-
connect and inrush current limiting. The device includes a
0.10 ? N-channel MOSFET switch and a 0.14 ? P-channel
synchronous rectifier. This product has the ability to sim-
ply program the output voltage, switching frequency, cur-
rent limit, soft-start, Burst Mode threshold and loop
compensation with external passive components.
Quiescent current is only 12 μ A during Burst Mode opera-
tion, maximizing battery life in portable applications. The
oscillator frequency can be programmed up to 3MHz and
can be synchronized to an external clock applied to the
SYNC pin. An open-drain uncommitted low-battery com-
parator is included. The part maintains operation in
applications with a secondary cell powering the output
voltage during shutdown.
Other features include: 1 μ A shutdown, antiringing control,
APPLICATIO S
thermal limit and reference output.
The LTC3421 is available in a small 4mm × 4mm QFN
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Handheld Computers
Cordless Phones
GPS Receivers
Battery Backup Supplies
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V IN
1.8V TO 3V
L1
4.7 μ H
2-Cell to 3.3V Efficiency
2
CELLS
C1*
4.7 μ F
4
3
23
22
7
8
2
SHDN
ENB
V REF
LBI
LBO
SYNC
I LIM
21 14 15 16
V IN SW SW SW
V OUTS
V OUT
V OUT
LTC3421 V OUT
FB
V C
18
17
19
20
1
24
340k
V OUT
3.3V
1.2A
C5*
22 μ F
100
90
80
70
60
50
40
Burst Mode OPERATION
V IN = 3V
V IN = 2.4V
V IN = 2V
45.3k
0.1 μ F
SS
6
R T
5
28k
9
BURST
GND PGND PGND PGND
10 11 12 13
0.1 μ F
470pF
20k
100k
200k
30
20
10
0
V OUT = 3.3V
f OSC = 1MHz
0.1
1
10 100
1000
*LOCATE COMPONENTS CLOSE TO PINS
C1: TAIYO YUDEN JMK212BJ106MM
C5: TAIYO YUDEN JMK325BJ226MM
L1: TDK RLF7030T-4R7M3R4
3421 TA01
OUTPUT CURRENT (mA)
3421 G02
3421f
1
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相关代理商/技术参数 |
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| LTC3422 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 3MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LTC3422EDD | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 0.5V to 4.5V 10-Pin DFN EP |
| LTC3422EDD#PBF | 功能描述:IC REG BOOST SYNC ADJ 1.5A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3422EDD#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 1.5A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3423 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Low Output Voltage 3MHz Micropower Synchronous Boost Converters |
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